186 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



sal and lateral green stripe on abdomen; abdomen underneath violet. 

 Wings hyaline, the veins black; the margins broadly black. Prima- 

 ries: a large black spot at end of cell. 



Expanse. — 33 nun. 



Habitat. — Geldersland, Surinam River, Dutch Guiana. 



Type.—Q^i. No. 8488, U.S.N.M. 



LEUCOTMENSIS THORACICA, new species. 



Antenna black, tipped with white. Head and abdomen black; ver- 

 tex l)lue; a sul)dorsal row of green spots, and a lateral broad green 

 stripe on abdomen. Collar and thorax ochreous 3'ellow; some 

 ochreous on thorax underneath. Wings hyaline, the veins black; the 

 margins broadly black. Primaries: a large black spot at end of cell, 

 which is also irrorated with black scales. 



Expanse. — 30 mm. 



Habitat. — Captured on a small island 100 miles up the Maroni River. 



TyjM.—Cvit. No. 8489, U.S.N.M. 



Genus COSMOSOMA HulDiier. 

 COSMOSOMA THORACICUM, new species. 



Collar and thorax ochreous orange. Body otherwise black; frons 

 spotted with blue; two blue dorsal spots on first segment of abdomen, 

 lateral blue spots on other segments. Wings hyaline. Primaries: base 

 ochreous orange; margins black, the apex broadly so; space between 

 veins 2 and 3 to inner angle, also between 3 and 4 close to cell black; 

 veins and discocellular black. Secondaries: the margins broadly black. 



Expanse. — 24 mm. 



Habitat. — 100 miles up the Maroni River, French Guiana. 



Typ^.— Cat. No. 8490, U.S.N.M. 



Genus PCECILOSOM A Hubner. 

 PCECILOSOMA VESPOIDES, new species. 



Antenna? black. Bod}^ orange yellow. Legs streaked with black; 

 palpi tipped with black; a black spot on vertex; a large black spot on 

 thorax anteriorly; patagia tipped with black. Abdomen banded with 

 black. Wings hyaline; the veins and fringe black; the apices nar- 

 rowly black. Primaries: an ochreous streak on costal margin to near 

 apex; a short streak at base of inner margin. 



Expanse. — 24 mm. 



Habitat. — Carabaj^a, Peru. 



Type.—Q2.t. No. 8491, U.S.N.M. 



